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Interlacing Families II: Mixed Characteristic Polynomials and the Kadison-Singer Problem

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(2013)

Abstract

We use the method of interlacing families of polynomials to prove Weaver's conjecture KS2, which is known to imply a positive solution to the Kadison-Singer problem via a projection paving conjecture of Akemann and Anderson. Our proof goes through an analysis of the largest roots of a family of polynomials that we call the "mixed characteristic polynomials" of a collection of matrices.

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